hmmm....let's see:
Ravel's Bolero - its 8 minutes long, is based on only one chord...and the melody is exactly the same, but played on clarinet, alto sax, e-flat clarinet, tenor sax, then the whole orchestra. zzzzzzz...
Eric Whitacre's Water Night - I love music that Eric Whitacre writes...the exception is Water Night. It's basically an abstract melody, with the second sopranos, altos, and basses singing every note in the minor scale at once.
Stravinsky's The Rite of Spring - the opening bassoon solo is kinda cool, but everything else is just...hard to listen to
Pachelbel Canon - I played this in church. The violin part is cool, but the whole piece is just so...repetitive, not to mention overused.
A lot of electronic/techno music...it's basically 21st century Bolero: one chord....repeating...same damn thing...over and over...8 minutes of my life wasted listening to drum and synth loops....